Folding endurance is the paper's capability of withstanding multiple folds before it breaks. It is defined as the number of double folds that a strip of 15 mm wide and 100 mm length can withstand under a specified load before it breaks. It is important for printing grades where the paper will be subjected to multiple folds like in books, maps, or pamphlets. Folds test is also important for carton, box boards, ammonia print paper, and cover paper etc. Fold test is also used as an indicator for aging properties of paper as it is a sensitive measure of influence tending to degrade fiber.

Folding endurance is a requirement in Bond, Ledger, Currency, Map, Blue Print and Record Papers.